[inigyou]

Residential proxy bandwidth is extremely expensive, comparatively speaking. It can be up to $1 per GB but is more typically about $0.20 per GB.

[jimmydorry]

Right, this is orthagonal to the discussion though. While the IPs and bandwidth might be free, managing the malware botnet and trying to keep a low profile so as to not attract attention of authorities, makes it a risky market to cater to.

Those rates are still cheaper than some datacentres charge in parts of the world.